Domestic refrigeration



INVENTOR.

Se t. 17, 1935. w. w WILLIAMS DOMESTIC REFRIGERATION Filed July 15, 1935A TTORNEYS.

W6 4 ER W. WILL /HMJ FQJJJJJIUIDI FL Patented Sept. 17, 1935 PATENTOFFICE 2,014,917 DOMESTIC REFRIGERATION Walter w. Williams; Bloomington,n1. v Application July 15,1933, Serial No. 680,535

2 Claims.

This invention relates to improvements indomestic refrigeration and moreparticularly to the location and construction of the evaporator within adomestic ice box or cabinet.

In the present day commercial electrically operated refrigerating unitsfor domestic purposes, it is customary to arrange the evaporator withinthe ice box or cabinet in such a manner that the coils of the evaporatorform a container which supports pans for freezing cubes of ice. Such anarrangement usually consumes considerable space which could otherwise beused for the storage of such perishable goods as are usually placed inice boxes. Furthermore, in order. to freeze cubes of ice in the'ice pansit is necessary that the temperature of the evaporator coils be muchlower than that. necessary to keep the perishable goods contained in thebox from spoiling with the result that the moisture from the goodscondenses upon the evaporator and then freezes to such an extent that itis necessary to defrost the evaporator periodically.

It is an object, of this invention to provide a domestic ice box with adomestic refrigerating unit and arrangethe evaporator coil therein toallow the greatest space possible for the storage of perishable goodsand by continuing the coil from top to bottom of the interior of thecabinet to provide an even temperature throughout the cabinet suficientto prevent spoiling of the contained goods without causing excessivecondensation freezing upon the coils and thereby obviate the necessityof defrosting.

A preferred form of this invention is illustrated upon the accompanyingsheet of drawing with the understanding that minor detailed changes maybe made therein without departing from the scope thereof.

In the drawing:

Figure l is a view in front elevation of a' preferred embodiment of thisinvention with parts broken away.

Figure 2 is 'a view in end elevation of Figure 1 with parts broken awayand partly in vertical section.

Figure 3 is an enlarged fragmentary detailed view in elevation taken onthe line 3-3 of Fig-- ure 1.

Figure 4 is a view similar to'Figure 3 of a modified form.

Figure is a view similar to Figure 3 of'another modified form. r

In the embodiment illustrated. a commercial ice box or cabinet I isprovided with a domestic refrigerating unit 2 placed on the top thereof;

The interior of the box is formed of metal plates 3 spaced apart fromthe outer walls of the cabinet or box with the space therebetween filledwith any desired insulating material 4 such as rock wool. The front ofthe box is closed by an 5 air tight door 5 in the usual manner so thatwhen the door is closed and latched the compartment within the cabinetor box is substantially air tight.

The refrigerant is circulated from the refriger ating unit through apipe 6, expansion valve V v and through the outer and inner walls of thecabinet to the evaporator 'coil I. In the type shown in Figures 1, 2 and3, the evaporator coil 1 passes back and forth in tortuous path from a.

top to bottom across the width of the back plate 3 forming equi-distantparallel continuous con.- volutions, the bottom convolution of which isconnected to pipe 8 which passes upward at one side and passes throughthe spaced apart walls of thecabinet and joins pipe 9 which returns therefrigerant to the suction side of the refrigerating unit. In this formthe evaporator coils are spot-welded or otherwise secured to the backplate 3 and the coils passed back and forth within the cooling, space ofthe cabinet or ice box, without interfering with the customary trays forthe support of perishable goods. In this manner the evaporator whichabsorbs the heat from within the cabinet extends across the entire backof the cabinet so that an even temperature is produced in all parts ofthe cabinet and at the same time occupies but little space within thecabinet.

If desired, the evaporatorcoils I may be secured to plate 3 on that sideadjacent to spaced apart outer wall, as shown in Figure 4. In this casethe outer and inner walls of the cabinet, containing between them theinsulating packing 4, are air tight. The temperature of the plate 3 isreduced but no condensation can collect upon the evaporator coils withinthe air tight space v between walls. This arrangement provides an evengreater space for storage of goods in the cabinet or box.

If desired, the wall mounting the evaporator coils may be formed of twothin sheets of metal 3--A and 3-3. Complementary spaces are embossed andthe plates welded together to form the evaporator coil '|A. As abovestated in this form the evaporator coils are formed in the wall of thecooling compartment of the box and condensation will only form uponplate 3A.

By forming an evaporator which extends throughout a wall of the cabinetthe temperature is reduced equally throughout the interior of thecooling space and such moisture as-may condense and freeze upon theevaporator or plate will readily melt and drain 01! during the periodsthe unit is not in operation.

It is understood that this invention is not restricted to the type ofbox and refrigerating unit illustrated. The unit illustrated is of acommercial form such as disclosed in this applicant's prior patent, No.1,838,063 of December 22, 1931 and may be of any other recognizedcommercial type, employing an expansion type of evaporator and may beplaced upon the exterior of the cabinet as shown or placed within aspecial section of the cabinet if desired.

The operation of the refrigerating unit is controlled by a thermostat toautomatically regulate and maintain an even predetermined temperaturewithin the box, as is customary in such cases. This may be accomplishedby any of the recognized means in use today and forms no part of thisinvention.

What I claim is:-

I. In a domestic refrigerator box having an insulated coolingcompartment surrounded by spaced apart insulated walls, the combinationof a refrigerating unit arranged exteriorly of said I compartment withthe evaporator coil thereof arranged with its convolutions in the sameplane welded upon a wall of said cooling compartment to be containedbetween said spaced apart walls.

, 2. In a domestic reirigerating box having an insulated coolingcompartment surrounded by spaced apart insulated walls, thecombinationcontact with a wall and welded thereto of said coolingcompartment and surrounded by insulation except at the point of contact.

WALTER W. WILLIAMS.

